my upper back is weak, I have a lot of trouble pinching my shoulders back before the lift. After my first lift I really start to round my upper back bad, I have a completely different starting position for the 2,3,4,5 lift

I lost my balance on the fourth rep which is why my feet came up, I know not to lean back on the heels like that.

Felt a lot of pressure on my lower back on the 295lb, not pain but it feel like my back was anchoring the weight up after my legs were mostly extended.

I'm not using cross grip, just straight overhand grip, so at least I have that :) otherwise I'm pretty discouraged. probably shoot my squats for next week, my lifts have not been going well, feel like i'm just chasing problems around in circles and one thing destroys everything else.

your bar is swerving around all over the place. stop that immediately! straight up, straight down. don't maneuever the bar around you, maneuver yourself around the bar path. that's gonna take some training to get right.

work on that first of all, nevermind the numbers - i'm not sure how much movement detail you need, so i'm not gonna go into detail.